The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/joy/joy.c

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    1 /*-
    2  * Copyright (c) 1995 Jean-Marc Zucconi
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/5.4/sys/dev/joy/joy.c 130585 2004-06-16 09:47:26Z phk $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/conf.h>
   36 #include <sys/uio.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/bus.h>
   40 #include <machine/bus.h>
   41 #include <machine/resource.h>
   42 #include <sys/rman.h>
   43 #include <sys/time.h>
   44 #include <sys/joystick.h>
   45 #include <dev/joy/joyvar.h>
   46 
   47 /* The game port can manage 4 buttons and 4 variable resistors (usually 2
   48  * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201.
   49  * Getting the state of the buttons is done by reading the game port:
   50  * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
   51  * to bits 0-3.
   52  * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0
   53  * to get the value of a resistor, write the value 0xff at port and
   54  * wait until the corresponding bit returns to 0.
   55  */
   56 
   57 #define joypart(d) (minor(d)&1)
   58 #define UNIT(d) ((minor(d)>>1)&3)
   59 #ifndef JOY_TIMEOUT
   60 #define JOY_TIMEOUT   2000 /* 2 milliseconds */
   61 #endif
   62 
   63 #define JOY_SOFTC(unit) (struct joy_softc *) \
   64         devclass_get_softc(joy_devclass,(unit))
   65 
   66 static  d_open_t        joyopen;
   67 static  d_close_t       joyclose;
   68 static  d_read_t        joyread;
   69 static  d_ioctl_t       joyioctl;
   70 
   71 static struct cdevsw joy_cdevsw = {
   72         .d_version =    D_VERSION,
   73         .d_flags =      D_NEEDGIANT,
   74         .d_open =       joyopen,
   75         .d_close =      joyclose,
   76         .d_read =       joyread,
   77         .d_ioctl =      joyioctl,
   78         .d_name =       "joy",
   79 };
   80 
   81 devclass_t joy_devclass;
   82 
   83 int
   84 joy_probe(device_t dev)
   85 {
   86 #ifdef WANT_JOYSTICK_CONNECTED
   87 #ifdef notyet
   88         outb(dev->id_iobase, 0xff);
   89         DELAY(10000); /*  10 ms delay */
   90         return (inb(dev->id_iobase) & 0x0f) != 0x0f;
   91 #else
   92         return (0);
   93 #endif
   94 #else
   95         return (0);
   96 #endif
   97 }
   98 
   99 int
  100 joy_attach(device_t dev)
  101 {
  102         int     unit = device_get_unit(dev);
  103         struct joy_softc *joy = device_get_softc(dev);
  104 
  105         joy->rid = 0;
  106         joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid,
  107             RF_ACTIVE);
  108         if (joy->res == NULL)
  109                 return ENXIO;
  110         joy->bt = rman_get_bustag(joy->res);
  111         joy->port = rman_get_bushandle(joy->res);
  112         joy->timeout[0] = joy->timeout[1] = 0;
  113         joy->d = make_dev(&joy_cdevsw, 0, 0, 0, 0600, "joy%d", unit);
  114         return (0);
  115 }
  116 
  117 int
  118 joy_detach(device_t dev)
  119 {
  120         struct joy_softc *joy = device_get_softc(dev);
  121 
  122         if (joy->res != NULL)
  123                 bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res);
  124         if (joy->d)
  125                 destroy_dev(joy->d);
  126         return (0);
  127 }
  128 
  129 
  130 static int
  131 joyopen(struct cdev *dev, int flags, int fmt, struct thread *td)
  132 {
  133         int i = joypart (dev);
  134         struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  135 
  136         if (joy->timeout[i])
  137                 return (EBUSY);
  138         joy->x_off[i] = joy->y_off[i] = 0;
  139         joy->timeout[i] = JOY_TIMEOUT;
  140         return (0);
  141 }
  142 
  143 static int
  144 joyclose(struct cdev *dev, int flags, int fmt, struct thread *td)
  145 {
  146         int i = joypart (dev);
  147         struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  148 
  149         joy->timeout[i] = 0;
  150         return (0);
  151 }
  152 
  153 static int
  154 joyread(struct cdev *dev, struct uio *uio, int flag)
  155 {
  156         struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  157         bus_space_handle_t port = joy->port;
  158         bus_space_tag_t bt = joy->bt;
  159         struct timespec t, start, end;
  160         int state = 0;
  161         struct timespec x, y;
  162         struct joystick c;
  163 #ifndef __i386__
  164         int s;
  165 
  166         s = splhigh();
  167 #else
  168         disable_intr ();
  169 #endif
  170         bus_space_write_1 (bt, port, 0, 0xff);
  171         nanotime(&start);
  172         end.tv_sec = 0;
  173         end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
  174         timespecadd(&end, &start);
  175         t = start;
  176         timespecclear(&x);
  177         timespecclear(&y);
  178         while (timespeccmp(&t, &end, <)) {
  179                 state = bus_space_read_1 (bt, port, 0);
  180                 if (joypart(dev) == 1)
  181                         state >>= 2;
  182                 nanotime(&t);
  183                 if (!timespecisset(&x) && !(state & 0x01))
  184                         x = t;
  185                 if (!timespecisset(&y) && !(state & 0x02))
  186                         y = t;
  187                 if (timespecisset(&x) && timespecisset(&y))
  188                         break;
  189         }
  190 #ifndef __i386__
  191         splx(s);
  192 #else
  193         enable_intr ();
  194 #endif
  195         if (timespecisset(&x)) {
  196                 timespecsub(&x, &start);
  197                 c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
  198         } else
  199                 c.x = 0x80000000;
  200         if (timespecisset(&y)) {
  201                 timespecsub(&y, &start);
  202                 c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
  203         } else
  204                 c.y = 0x80000000;
  205         state >>= 4;
  206         c.b1 = ~state & 1;
  207         c.b2 = ~(state >> 1) & 1;
  208         return (uiomove((caddr_t)&c, sizeof(struct joystick), uio));
  209 }
  210 
  211 static int
  212 joyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
  213 {
  214         struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  215         int i = joypart (dev);
  216         int x;
  217 
  218         switch (cmd) {
  219         case JOY_SETTIMEOUT:
  220                 x = *(int *) data;
  221                 if (x < 1 || x > 10000) /* 10ms maximum! */
  222                         return EINVAL;
  223                 joy->timeout[i] = x;
  224                 break;
  225         case JOY_GETTIMEOUT:
  226                 *(int *) data = joy->timeout[i];
  227                 break;
  228         case JOY_SET_X_OFFSET:
  229                 joy->x_off[i] = *(int *) data;
  230                 break;
  231         case JOY_SET_Y_OFFSET:
  232                 joy->y_off[i] = *(int *) data;
  233                 break;
  234         case JOY_GET_X_OFFSET:
  235                 *(int *) data = joy->x_off[i];
  236                 break;
  237         case JOY_GET_Y_OFFSET:
  238                 *(int *) data = joy->y_off[i];
  239                 break;
  240         default:
  241                 return (ENOTTY);
  242         }
  243         return (0);
  244 }

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